Vertical Gardening :: The Hometalk Team's clipboard on
"Plants have best friends just like people do. Marigolds help tomatoes and roses grow better. Nasturtiums keep bugs away from squash and broccoli. Petunias protect beans from beetles and oregano chases them away from cucumbers. Geraniums keep Japanese beetles away from roses and corn. Chives make carrots sweeter, and basil makes tomatoes even tastier"
Basil attracts butterflies and repels other pests. Oregano repels aphids. Carrots attract insects beneficial to the garden particularly the tomato. (See more Carrot Companions) Onions/Chives repel pests.
In case you're wondering what to plant in your garden next year, here is a cool chart with lots of companion planting tips! Too bad raspberries aren't on here, but they did really well this year with my tomatoes and cucumbers.